Chrysanthemum plant named ‘Yosnowmass’

ABSTRACT

A new and distinct cultivar of  Chrysanthemum  plant named ‘Yosnowmass’, characterized by its upright and mounded plant habit; vigorous and strong growth habit; large dark green-colored foliage; uniform flowering response and habit; early flowering habit; large decorative incurved-type inflorescences with elongated oblong-shaped and white-colored ray florets; and good postproduction longevity with plants maintaining good substance and color for about three to four weeks in an interior environment.

Botanical designation: Chrysanthemum×morifolium.

Cultivar denomination: ‘Yosnowmass’.

BACKGROUND OF THE INVENTION

The present Invention relates to a new and distinct cultivar of Chrysanthemum plant, botanically known as Chrysanthemum×morifolium and hereinafter referred to by the name ‘Yosnowmass’.

The new Chrysanthemum is a product of a planned breeding program conducted by the Inventor in Salinas, Calif. and Alva., Fla. The objective of the program is to create or discover new potted Chrysanthemum cultivars that are suitable for year-round production with uniform plant growth habit, good vigor, desirable inflorescence form and floret colors, fast and uniform flowering response and good postproduction longevity.

The new Chrysanthemum originated from a cross-pollination made in November, 1999 in Salinas, Calif. of a proprietary selection of Chrysanthemum×morifolium identified as code number YB-4699, not patented, as the female, or seed, parent with a proprietary selection of Chrysanthemum×morifolium identified as code number YB-4976, not patented, as the male, or pollen, parent. The new Chrysanthemum was discovered and selected by the Inventor as a single flowering plant within the progeny of the stated cross-pollination grown in a controlled environment in Alva, Fla. in November, 2000. The selection of this plant was based on its uniform plant growth habit, good vigor and strong branching habit, desirable inflorescence form and floret colors, fast and uniform flowering response, and good postproduction longevity.

Asexual reproduction of the new Chrysanthemum by vegetative tip cuttings was first conducted in Alva, Fla. in March, 2001. Asexual reproduction by cuttings has shown that the unique features of this new Chrysanthemum are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

The cultivar Yosnowmass has not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment such as temperature, daylength, and/or light level, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘Yosnowmass’. These characteristics in combination distinguish ‘Yosnowmass’ as a new and distinct Chrysanthemum:

-   -   1. Upright and mounded plant habit.     -   2. Vigorous and strong growth habit.     -   3. Large dark green-colored foliage.     -   4. Uniform flowering response and habit.     -   5. Typically grown as a single stem (nonpinched) disbud-type.     -   6. Early flowering habit.     -   7. Large decorative incurved-type inflorescences with elongated         oblong-shaped ray florets.     -   8. White-colored ray florets.     -   9. Good postproduction longevity with plants maintaining good         substance and color for about three to four weeks in an interior         environment.

Plants of the new Chrysanthemum can be compared to plants of the female parent selection. Plants of the new Chrysanthemum differ from plants of the female parent selection in the following characteristics:

-   -   1. Plants of the new Chrysanthemum flower about one week earlier         than plants of the female parent selection.     -   2. Plants of the new Chrysanthemum and the female parent         selection differ in ray floret color as plants of the female         parent selection have pink-colored ray florets.

Plants of the new Chrysanthemum can be compared to plants of the male parent selection. Plants of the new Chrysanthemum differ from plants of the male parent selection in the following characteristics:

-   -   1. Ray florets of plants of the new Chrysanthemum are purer         white than ray florets of plants of the male parent selection.     -   2. Inflorescences of plants of the new Chrysanthemum produce few         disc florets whereas inflorescences of plants of the male parent         selection produce many disc florets.

Plants of the new Chrysanthemum can be compared to plants of the cultivar Yoyukon, disclosed in U.S. Plant patent application Ser. No. 11/157,454. In side-by-side comparisons conducted in Alva, Fla., plants of the new Chrysanthemum differed from plants of the cultivar Yoyukon in the following characteristics:

-   -   1. Inflorescences of plants of the new Chrysanthemum were more         incurved in form than inflorescences of plants of the cultivar         Yoyukon.     -   2. Ray florets of plants of the new Chrysanthemum were purer         white than ray florets of plants of the cultivar Yoyukon.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the overall appearance of the new Chrysanthemum showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ from the color values cited in the detailed botanical description which accurately describe the colors of the new Chrysanthemum.

The photograph on the first sheet comprises a side perspective view of typical flowering plants of ‘Yosnowmass’ grown as single stem disbud-types.

The photograph on the second sheet comprises a close-up view of a typical inflorescence of ‘Yosnowmass’.

DETAILED BOTANICAL DESCRIPTION

In the following description, color references are made to The Royal Horticultural Society Colour Chart, 1995 Edition, except where general terms of ordinary dictionary significance are used. The aforementioned photographs, following observations and measurements describe plants grown and flowered during the summer in Salinas, Calif., in a fiberglass-covered greenhouse and under conditions which approximate those generally used in commercial potted Chrysanthemum production. During the production of these plants, the following conditions were measured: day temperatures, 21° C. to 27° C.; night temperatures, 17° C. to 19° C.; and light levels, 5,000 to 6,000 foot-candles. Four unrooted cuttings were directly stuck in 15-cm containers, exposed to long day/short night conditions, and were grown as single stem (nonpinched) plants. About two weeks later, the photoinductive short day/long night treatments were initiated. Plants used for the description were grown as disbud-types. Measurements and numerical values represent averages of typical flowering plants.

-   Botanical classification: Chrysanthemum×morifolium cultivar     Yosnowmass. -   Commercial classification: Decorative incurved-type potted     Chrysanthemum. -   Parentage:     -   -   Female, or seed, parent.—Proprietary selection of             Chrysanthemum×morifolium identified as code number YB-4699,             not patented.         -   Male, or pollen, parent.—Proprietary selection of             Chrysanthemum×morifolium identified as code number YB-4976,             not patented. -   Propagation:     -   -   Type.—Terminal tip cuttings.         -   Time to initiate roots.—About four days at 21° C.         -   Time to produce a rooted cutting.—About ten days at 21° C.         -   Root description.—Fibrous; white, close to 155D, in color.         -   Rooting habit.—Freely branching; moderately dense. -   Plant description:     -   -   Appearance.—Herbaceous decorative incurved-type potted             Chrysanthemum that is typically grown as a single stem             (nonpinched) disbud-type. Upright and somewhat outwardly             spreading; mounded crown. Vigorous and strong growth habit.         -   Plant height.—about 29.5 cm.         -   Plant width.—About 35.5 cm.         -   Lateral branches (peduncles).—Length: About 26 cm. Diameter:             About 5 mm. Internode length: About 1.3 cm. Strength:             Strong. Texture: Pubescent. Color: 146A.         -   Foliage description.—Arrangement: Alternate; simple. Length:             About 11.8 cm. Width: About 9 cm. Apex: Cuspidate. Base:             Mostly truncate. Margin: Palmately lobed, sinuses between             lateral lobes mostly parallel. Texture, upper and lower             surfaces: Pubescent. Color: Developing and fully expanded             foliage, upper surface: Darker green than 147A. Developing             and fully expanded foliage, lower surface: Close to 147B.             Venation, upper and lower surfaces: Close to 147B. Petiole             length: About 2.6 cm. Petiole diameter: About 5 mm. Petiole             texture, upper and lower surfaces: Pubescent. Petiole color,             upper surface: Close to 146A. Petiole color, lower surface:             Close to 146A to 146B. -   Inflorescence description:     -   -   Appearance.—Decorative incurved-type inflorescence form with             elongated oblong-shaped ray florets. Inflorescences borne on             terminals above foliage. Disk and ray florets develop             acropetally on a capitulum. Inflorescences slightly             fragrant.         -   Flowering response.—Under natural conditions, plants flower             in the autumn/winter in the Northern Hemisphere. At other             times of the year, inflorescence initiation and development             can be induced under short day/long night conditions (at             least 13.5 hours of darkness). Uniform and early flowering             habit; plants exposed to three weeks of long day/short night             conditions followed by photoinductive short day/long night             conditions flower about eight weeks later.         -   Postproduction longevity.—Inflorescences maintain good color             and substance for about three to four weeks in an interior             environment.         -   Quantity of inflorescences.—Grown as a disbud-type, all the             lateral inflorescences are removed and only the terminal             inflorescence is allowed to develop.         -   Inflorescence bud.—Height: About 7 mm. Diameter: About 7 mm.             Shape: Oblate. Color: Close to 146A to more green than 147A.         -   Inflorescence diameter.—Large, about 12 cm.         -   Inflorescence height.—About 4.75 cm.         -   Diameter of disc.—About 4 mm; inconspicuous.         -   Receptacle diameter.—About 1.5 cm.         -   Receptacle height.—About 9 mm.         -   Ray florets.—Length: About 5.9 cm. Width: About 1.5 cm.             Corolla tube length: About 1.7 cm. Corolla tube diameter:             About 2 mm. Shape: Elongated oblong. Apex: Acute or             emarginate. Base: Attenuate and fused into a corolla tube.             Margin: Entire. Orientation: Initially incurved to             eventually perpendicular. Texture, upper and lower surfaces:             Smooth, glabrous; satiny. Number of ray florets per             inflorescence: About 506 arranged in numerous whorls. Color:             When opening and fully opened, upper surface: Close to 155D.             When opening and fully opened, lower surface: Close to 155D.         -   Disc florets.—Arrangement: Massed at center of receptacle.             Length: About 7.5 mm. Diameter, apex: About 2 mm. Diameter,             base: About 2 mm. Shape: Tubular; elongated. Apex:             Five-pointed. Number of disc florets per inflorescence:             About 18. Color: Immature: Close to 144A. Mature, apex:             Close to 9A. Mature, mid-section: Close to 154D. Mature,             base: Close to 155D.         -   Phyllaries.—Quantity per inflorescence: About 28 arranged in             two to three whorls. Length: About 1.2 cm. Width: About             5 mm. Shape: Lanceolate. Apex: Acute. Base: Truncate.             Margin: Entire. Texture, upper surface: Waxy, smooth.             Texture, lower surface: Pubescent. Color, upper surface:             Close to 146A. Color, lower surface: Close to 146A to more             green than 147A.         -   Reproductive organs.—Androecium: Present on disc florets             only. Anther length: About 2 mm. Anther color: Close to 9A             to 12A. Pollen amount: None observed. Gynoecium: Present on             both ray and disc florets. Style length: About 8 mm. Style             color: Close to 144A. Stigma color: Close to 9A.         -   Seed/fruit.—Seed and fruit production has not been observed. -   Disease/pest resistance: Plants of the new Chrysanthemum exhibited     good resistance to Fusarium oxysporum and Fusarium solani in     inoculated trials in 2005. Resistance to pests and other pathogens     common to Chrysanthemums has not been observed on plants grown under     commercial greenhouse conditions. 

1. A new and distinct cultivar of Chrysanthemum plant named ‘Yosnowmass’, as illustrated and described. 